The victra-12 mount assembly is a bit different than the ordinary mount assembly.Threads into the end of shotgun's barrel using the standard choke threads to mount the suppressor to the shotgun, but it does not choke the shot.That is handled by the unique front-installed choke.Each mount is shotgun-manufacturer specific and we offer a multitude of mounts that function with most popular shotguns.Length: 2.89"Model: VICTRA-12Finish: Melonite